A US woman who shot and killed her husband and two adult children before taking her own life is thought to have committed the shocking crime as a result of being ostracised from the religion she was raised in.

A federal judge sentenced a former Arkansas judge Wednesday to five years in prison — a stiffer punishment than prosecutors recommended — after he admitted giving young male defendants lighter sentences in return for personal benefits that included sexual favours.

Every time I tell a mate I’m doing a story on cryptocurrency, they invariably ask me the same two questions: should they invest their own hard-earned money, and which cryptocurrency will get them a Lamborghini/yacht/island quickest?

In a 60 Minutes online exclusive, reporter Liz Hayes quizzed Australian Prime Minister Malcolm Turnbull on his relationship with the unpredictable Twitter aficionado and US president Donald Trump ahead of their meeting at the White House Friday.

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The Liberal Senate group voting ticket - which allocates preferences for above-the-line voting - issued at the weekend didn't put the Greens put last in South Australia, NSW, Victoria, Queensland and Western Australia. However, the minor party was preferenced behind Labor.

Mr Abbott said the Greens were "anti-jobs".

"The Labor leader has put politics ahead of jobs by preferencing the Greens ahead of the coalition everywhere," he said.

"What I said was (the Greens) are going last of all the significant parties and that is exactly where they've been (put)."

Prime Minister Kevin Rudd said it was clear the coalition was not putting the Greens last.

Labor will preference the Greens over the coalition in the Senate - except in Queensland where it's done a deal with Katter's Australian Party.

The Greens will return the favour, and many of its local branches intend to preference Labor in lower house marginal seats.

Meanwhile, Mr Rudd defended his party's decision not to put disgraced MP Craig Thomson last on its how-to-vote card for the NSW Central Coast seat of Dobell.

The former Labor turned independent MP comes fifth in Labor's line-up of the nine candidates.

"He's way down the ticket," Mr Rudd said.

The ALP's "universal practice" was to preference only the top three candidates, he said.